Modification of respiratory and carbohydrate status of barley hordeum distichum cultivar maris mink roots by selective pruning

Farrar, J.F.; Jones, C.L.

New Phytologist 102(4): 513-522


ISSN/ISBN: 0028-646X
Accession: 005911958

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Barley plants were pruned selectively to give root systems with relative growth rates that varied two-fold. Rates of elongation of the seminal root axes were unaffected. Respiration rate was highest in the fast-growing roots, but there was no change in the proportion of carbon entering the root that was subsequently lost in respiration. Soluble sugar contents were greater in fast than in slow growing plants, but the rate of uptake of exogenously supplied sucrose and glutamine was highest where root growth rate was reduced by pruning of the shoot. Turnover of sugars in the vacuole was slower in roots with reduced growth rate.